A standard galvanic cell is constructed in which a Pb2+ | Pb half cell acts as the cathode. Which of the following statements are correct? 1. Pb is oxidized at the cathode.
2. In the external circuit, electrons flow from the Pb2+|Pb compartment to the other compartment.
3. As the cell runs, anions will migrate from the Pb2+|Pb compartment to the other compartment.
4. The anode compartment could be I2|I-.
5. The anode reaction could be Cr2+ -> Cr3+ + e-

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.